Shock-absorber.



P. GRESSER.

SHOGKABSORBER.

APPLICATION FILED JAN.19, 1914.

1,099,646. Patented June 9, 1914.

2 SHEETS-SHEET l- WITHESSES IHVENTOR P. GBESSER.

SHOCK ABSORBER.

APPLICATION FILED JAN. 19, 1914.

1,099,646. Patented June 9,1914.

2 SHEETS-SHEET 2.

5 WITNESSES INVEHTUR T JIW )UMIA) flTTOR HEY UNITED STATES PATENTOFFICE.

PETER GRESSER, OF DETROIT, MICHIGAN, ASSIGNOR TO THE BUCKEYE SUSPENSIONCOMPANY, A. CORPORATION OF OHIO.

SHOCK-ABSORBER.

Specification of Letters Patent.

Patented June 9, 1914.

Application filed January 19, 1914. Serial No. 812,923.

To all whom it may concern Be it known that I, Pn'rnR GRESSER, a subjectof the Emperor of Germany, residing at Detroit, county of Wayne, Stateof Michigan, have invented a certain new and useful Improvement inShock-Absorbers, and declare the following to be a full, clear, andexact description of the same, such as will enable others skilled in theart towhich it pertains to make and use the same, reference being had tothe accompanying drawings, Which form a part of this specification.

This invention relates to shock absorbers and has for its object a shockabsorber of the two pivoted arm type in which the action of the springis resisted by spring resistance rather than the customary frietionalresistance of shock absorbers of this form.

In the drawings,Figure 1, is a view of the shock absorber showing itattached to the chassis and axle of a vehicle, the disklike head portionof one of the arms being removed to show the interior parts. Fig. 2, isa cross-section through the inclosing shell formed by the head portionsof the arms. Fig. 3, is a detail of one of the arms. Fig. i, is a detailof the other arm. Fig. 5, is a side elevation of the central element.Fig. 6, is an elevation showing the periphery of the central element.

a indicates a part of the chassis; b a fragment of the vehicle springwhich is attached to the axle 0. A bracket (Z is attached to eachelement and one bracket pivots each arm. The arms enlarge at their outerends each forming a disk-like head-- the arm a the head 6, the arm 6 thehead f. They are pivoted together by the central element or bearing 9.This central element comprises a member having its circular pe ripheryof four distinct diameters. The central portion is of the largestdiameter and may be called the spring spacer on account of its function.It is lettered it. On either side of this spring spacer are portions ofreduced diameter which will be called spring rests and which arelettered 2'. On the outside of each of these spring rests is a reducedportion which acts as a bearing for the disk-like head of the arm andwhich will be called the arm bearings On the outside of each of thesearm bearings is a still further reduced portion which is threaded andwhich is lettered 70. These will be known as the screw portions.

A coil spring Z is fastened to the lefthand spring rest 2' by having itsend at turned into the recess a of the left-hand spring rest. Its outerend 0 is attached to a block which projects outward from the plane ofthe spring. lVhen the disk-like head 6 of the arm. a is fitted over thescrew portion to bring the central opening 7) upon the left-hand armbearing j the notch g in the outer periphery of the disk-head 6 will fitover the projecting end 0. Hence the spring at one end is locked to thecentral element while at the other end it is locked to the arm element.Similarly on the opposite side of the spring spacer ha coil spring 7* islocated, the end .9 being similarly fastened to the central elementwhile the outer end 8 projects out of the plane of the spring and may beengaged by the notch a in the disk-like head f of the arm I). The headsof the arms are held in place by the nuts 1) on the end of the screwportion. Each of the heads is hrovided with a segmental slot the head 0with a slot to and the head f with the slot A pin 3 protrudes throughthe central ele ment and projects on either side of the spring rests.These projecting portions protrude through the segmental slots to andThese segmental slots are differently located with respect to thenotches on the disk-like heads so that only a single pin is required.However, by using protruding pin portions on the sides of the springrests, which are not in alinement, the slots w and a: may be located inthe same relation with respect to the notches on the periphery of thedisks.

When the shock is received by the springs which tends to cause the axleand the chassis to approach toward each other, the arms a and Z) aremade to approach each other. The arm Z) strikes the adjacent pinportions 1 while the arm (4 moves toward the arm Z) without striking itspin portion y. Hence the central element is caused to rotate slightly incounter-clockwise way (see Fig. 1). However, as the disk-like head f ofthe arm I) engages with the outer end 0 of the spring Z, this spring isnot brought into action for the disk head and central element do notrotate relatively to each other.

But the arm a with its disk-like head 6 engaging with the head 0 of thespring 1* causes the outer end of the spring 1" to be drawn around in aclockwise direction, while the central element rotating in acounterclockwise way and engaging with the other end 5 of the spring rcauses the inner end to be drawn around in a counter-clockwise way. Thisspring is therefore put under stress and resist the movement of the armsa and Z) together. Upon the rebound of the main springs of the vehiclethe other armthe arm mengages with its projecting pin portion 1/ and thecentral element is rotated in counter-clockwise way, but inasmuch as thehead 6 of the arm a is also rotating in counter-clockwise way the spring1" is not put under tension, but it will be found that the spring Zisput under tension by reason of the central element rotating incounterclockwise fashion and the head f of the arm I; rotating inclockwise fashion. Hence whichever way the arms are going, whetherapproaching or separating, either one or the other spring is put undertension and tends to resist the action of the vehicle springs.

In the drawings 1 have shown a ring 2 which incases the springs.v Thismay be attached to either one disk-head or the other, or for that mattertwo rings may be used to overlap, each ring being attached to one of thedisk heads.

What I claim is:

1. A shock absorber, comprising a pair of pivoted arms, a centralelement, a pair of coiled springs about the central element, one of thesprings being fastened to one arm and the central element, and the otherspring being fastened to the other arm and the central element, andmeans for connecting one arm to rotate the central element when the armsapproach each other and for connecting the other arm and the centralelement when the arms separate from each other.

2. A shock absorber, comprising a pair of pivoted arms having segmentalslots, a central element having projecting pin portions oneither sidethat move in the said segmental slots, and apair of coiled springs aboutthe central element, one fastened to the central element and one arm andthe other fastened to the central element and the other arm, wherebywhen the arms approach each other one arm moves the central element andwhen the arms separate from each other, the other arm moves the centralelement.

8. A shock absorber, comprising a pair of pivoted arms having segmentalslots, a central element consisting of a spring spacer and a spring reston each side of the spring spacer, and projecting pin portions, one oneach side of the spring rests, said projecting pin portions arranged tomove in said segmental slots, and a pair of coil springs one of which isfastened to the central element and one arm and the other of which isfastened to the central element and the other a 111.

4. A shock absorber, comprising a. pair of pivoted arms having disk-likeheads, a central element for pivoting the disk-like heads together andconsisting of a spring spacer, a spring rest on each side of the springspacer, and a projecting pin portion on the outside of each spring rest,the said disklike heads being provided with segmental slots throughwhich the pin portions protrude and peripheral notches, and a pair ofcoiled springs one of which is fastened to the central element and has alaterally ro jecting outer end that fits into peripheral notch of onearm and the other of which is fastened to the central element and hasanouter laterally projecting end that fits into the peripheral notch ofthe other arm.

In testimony whereof, I sign this specification in the presence of twowitnesses.

PETER GRESSER.

lVitnesses STUART C. BARNES, MARIETTA E. RUDD.

Copiesof this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

